GRB EXPERIMENT
... • To explain SGRs and AXPs, however, B must be greater than the quantum critical value 4.4 x 1013 G, where the energy between electron Landau levels equals their rest mass • Some AXPs and SGRs require B~1015 Gauss, so these magnetars have the strongest cosmic magnetic fields that we know of in the u ...
... • To explain SGRs and AXPs, however, B must be greater than the quantum critical value 4.4 x 1013 G, where the energy between electron Landau levels equals their rest mass • Some AXPs and SGRs require B~1015 Gauss, so these magnetars have the strongest cosmic magnetic fields that we know of in the u ...
Stellar Evolution Task
... You will have noticed that some horizontal branch stars seemed to be above the normal region favoured by the others. These special stars are variable stars. Maybe you can spot them in the image of an old stellar cluster. These special stars are used to determine distance in our Galaxy. ...
... You will have noticed that some horizontal branch stars seemed to be above the normal region favoured by the others. These special stars are variable stars. Maybe you can spot them in the image of an old stellar cluster. These special stars are used to determine distance in our Galaxy. ...
Temperate Earth-sized planets transiting a nearby ultracool
... Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India. ...
... Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India. ...
bildstencifar2010
... Palomar Transient Factory,Pan-Starrs1) and future (Dark Energy Survey, SkyMapper) supernovae surveys probe large volumes, revealing a diversity of ...
... Palomar Transient Factory,Pan-Starrs1) and future (Dark Energy Survey, SkyMapper) supernovae surveys probe large volumes, revealing a diversity of ...
A dozen new galaxies caught in the act: Gas stripping and extended
... radial velocity distribution of Coma cluster member galaxies. Our findings suggest that the most of the parent galaxies were recently captured by the Coma cluster potential and are now infalling toward the cluster center with their disk gas being stripped off and producing the observed Hα clouds. Su ...
... radial velocity distribution of Coma cluster member galaxies. Our findings suggest that the most of the parent galaxies were recently captured by the Coma cluster potential and are now infalling toward the cluster center with their disk gas being stripped off and producing the observed Hα clouds. Su ...
Information Equation of State
... all baryons that are in stars ~10-1 today as star birth and death rates become similar. Now the distribution of star types and temperature evolution with age becomes important. A detailed account of these effects to estimate the variation in average bit temperature in this recent period is beyond th ...
... all baryons that are in stars ~10-1 today as star birth and death rates become similar. Now the distribution of star types and temperature evolution with age becomes important. A detailed account of these effects to estimate the variation in average bit temperature in this recent period is beyond th ...
Galactic Stellar and Substellar Initial Mass Function Invited Review Gilles Chabrier
... population. Dynamical effects, yielding depletion of the lowest mass objects, are found to become consequential for ages !130 Myr. The spheroid IMF relies on much less robust grounds. The large metallicity spread in the local subdwarf photometric sample, in particular, remains puzzling. Recent obser ...
... population. Dynamical effects, yielding depletion of the lowest mass objects, are found to become consequential for ages !130 Myr. The spheroid IMF relies on much less robust grounds. The large metallicity spread in the local subdwarf photometric sample, in particular, remains puzzling. Recent obser ...
The fourth catalogue of Population I Wolf
... types adopted in the present catalogue originate primarily from such quantitative studies; the most recent works being given preference. The three-dimensional scheme for WN stars introduced by Smith et al. (1996), and currently employed by others (e.g. Crowther & Smith 1997; Morgan 1999), is largely ...
... types adopted in the present catalogue originate primarily from such quantitative studies; the most recent works being given preference. The three-dimensional scheme for WN stars introduced by Smith et al. (1996), and currently employed by others (e.g. Crowther & Smith 1997; Morgan 1999), is largely ...
Chasing the Pole — Howard L. Cohen
... Interestingly, all three stars in this triple system have similar principle spectral classes (Type F) showing they are all slightly hotter than the Sun. Polaris, however, is a supergiant or bright giant star, about 2,400 times more luminous than the Sun and 45 times larger in diameter, but much more ...
... Interestingly, all three stars in this triple system have similar principle spectral classes (Type F) showing they are all slightly hotter than the Sun. Polaris, however, is a supergiant or bright giant star, about 2,400 times more luminous than the Sun and 45 times larger in diameter, but much more ...
ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater⋆†
... formation. By classifying the satellite, on the basis of all available observational evidence, as a dwarf galaxy, we momentarily gloss over the details of its individual formation and evolution, and instead move on to modelling the population as a whole. We believe there are more than 20 dwarf galax ...
... formation. By classifying the satellite, on the basis of all available observational evidence, as a dwarf galaxy, we momentarily gloss over the details of its individual formation and evolution, and instead move on to modelling the population as a whole. We believe there are more than 20 dwarf galax ...
5.3 Convective transport
... for a pressure perturbation to travel across the volume of the gas parcel, is smaller than the timescale for a photon to cross the parcel taking into account the times it is absorbed and reemitted. That makes it obvious that we are talking about a parcel of gas that is many times larger than the mea ...
... for a pressure perturbation to travel across the volume of the gas parcel, is smaller than the timescale for a photon to cross the parcel taking into account the times it is absorbed and reemitted. That makes it obvious that we are talking about a parcel of gas that is many times larger than the mea ...
The SMC as a probe of dust in the early Universe
... proximity makes it a spatially resolved proxy for star−forming galaxies in the distant, early Universe. The sensitivity of the Spitzer Space Telescope allows us to to observe dust in nearly every stage of its life cycle in the SMC so that we can study how the interactions of dust and its host galaxy ...
... proximity makes it a spatially resolved proxy for star−forming galaxies in the distant, early Universe. The sensitivity of the Spitzer Space Telescope allows us to to observe dust in nearly every stage of its life cycle in the SMC so that we can study how the interactions of dust and its host galaxy ...
Planets orbiting stars more massive than the Sun
... is thus easily detected by CoRoT. This means that CoRoT must have detected all transiting giant planets with short orbital periods in these fields. To determine the frequency of close-in planets and BDs, all we have to do is to find out whether the transits are false-positives (FPs), eclipsing binar ...
... is thus easily detected by CoRoT. This means that CoRoT must have detected all transiting giant planets with short orbital periods in these fields. To determine the frequency of close-in planets and BDs, all we have to do is to find out whether the transits are false-positives (FPs), eclipsing binar ...
Radiation transfer
... where << 1 (the optically thin regime), and the other is where >> 1 (the optically thick regime). Note that we retain the explicit frequency dependence of optical depth, to allow for a difference between the behaviour between the core of emission lines (where optical depth may be high), and th ...
... where << 1 (the optically thin regime), and the other is where >> 1 (the optically thick regime). Note that we retain the explicit frequency dependence of optical depth, to allow for a difference between the behaviour between the core of emission lines (where optical depth may be high), and th ...
visual photometry - El Camino College
... Hipparchus classified all of the visible stars into 6 groups. The first group contained the brightest stars and the 6th group contained the faintest. Eventually, stars in the first group became known as “magnitude 1” stars, and in the 6th group as “magnitude 6” stars. Thus, the larger the number of ...
... Hipparchus classified all of the visible stars into 6 groups. The first group contained the brightest stars and the 6th group contained the faintest. Eventually, stars in the first group became known as “magnitude 1” stars, and in the 6th group as “magnitude 6” stars. Thus, the larger the number of ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.